Writing pen in the shape of a plane



FIG. 1 is a front perspective view of a writing pen in the shape of a plane showing my new design;

FIG. 2 is a left side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is rear elevational view;

FIG. 6 is a bottom plan view; and,

FIG. 7 is a top plan view thereof. 

The ornamental design for a writing pen in the shape of a plane, as shown and described. 